Touch the Export button and a summary of the time entries to be exported will be displayed,

Touch the Email button to create a new email, the time entries export file (Quickbooks.iif) will be attached to the email.

Send the email to your QuickBooks administrator

To import into QuickBooks:

Select the menu File > Timer > Import Activities from Timer.

Browse to the location were you saved the attached export file you sent, it should have an IIF extension

Click Open and the file will be imported into the QuickBooks Timesheets

Troubleshooting
Error message "You cannot import QuickBooks Pro Timer data for a different company. Please open the correct company file" - Ensure that you have the correct QuickBooks company file open, and that you have entered the Sync details correct into the TimeSheets app.